
 Speed Needed to Escape the Earth (Escape Velocity) 
  The escape velocity, as the minimum velocity that will allow a small body to escape from another body, can be calculated using the formula v = sqrt(2Gm/r), where G is the gravitational constant, r is the distance from the center of the body with a mass of m. 
  The speed needed to escape the earth or "escape velocity" is about 11,200 meters per second or 7 miles per second. 
  M is the mass of the earth, G is the gravitational constant, r is the earths radius, and v is escape velocity. 
 hypertextbook.com /facts/2005/LeoTam.shtml (732 words) 
